Lost cat, white and black (Ledgends of Maui Lani)

Orion got out last Friday and he usually comes back home, but he didn't this time. I'm worried someone kept him or maybe worse.. He got out of his collar last week and I hadn't put a new one on. He's white on the bottom black on top. Very small for an adult cat. Neutered. Very loving. He's chipped too. Please text msg if you've seen him.